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Python implementation of the io module.
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rPt||}n t d#| |}|rl|W S t|||||}|}||_|W S | Y nX dS )$a Open file and return a stream. Raise OSError upon failure.
file is either a text or byte string giving the name (and the path
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wrapped. (If a file descriptor is given, it is closed when the
returned I/O object is closed, unless closefd is set to False.)
mode is an optional string that specifies the mode in which the file is
opened. It defaults to 'r' which means open for reading in text mode. Other
common values are 'w' for writing (truncating the file if it already
exists), 'x' for exclusive creation of a new file, and 'a' for appending
(which on some Unix systems, means that all writes append to the end of the
file regardless of the current seek position). In text mode, if encoding is
not specified the encoding used is platform dependent. (For reading and
writing raw bytes use binary mode and leave encoding unspecified.) The
available modes are:
========= ===============================================================
Character Meaning
--------- ---------------------------------------------------------------
'r' open for reading (default)
'w' open for writing, truncating the file first
'x' create a new file and open it for writing
'a' open for writing, appending to the end of the file if it exists
'b' binary mode
't' text mode (default)
'+' open a disk file for updating (reading and writing)
'U' universal newline mode (deprecated)
========= ===============================================================
The default mode is 'rt' (open for reading text). For binary random
access, the mode 'w+b' opens and truncates the file to 0 bytes, while
'r+b' opens the file without truncation. The 'x' mode implies 'w' and
raises an `FileExistsError` if the file already exists.
Python distinguishes between files opened in binary and text modes,
even when the underlying operating system doesn't. Files opened in
binary mode (appending 'b' to the mode argument) return contents as
bytes objects without any decoding. In text mode (the default, or when
't' is appended to the mode argument), the contents of the file are
returned as strings, the bytes having been first decoded using a
platform-dependent encoding or using the specified encoding if given.
'U' mode is deprecated and will raise an exception in future versions
of Python. It has no effect in Python 3. Use newline to control
universal newlines mode.
buffering is an optional integer used to set the buffering policy.
Pass 0 to switch buffering off (only allowed in binary mode), 1 to select
line buffering (only usable in text mode), and an integer > 1 to indicate
the size of a fixed-size chunk buffer. When no buffering argument is
given, the default buffering policy works as follows:
* Binary files are buffered in fixed-size chunks; the size of the buffer
is chosen using a heuristic trying to determine the underlying device's
"block size" and falling back on `io.DEFAULT_BUFFER_SIZE`.
On many systems, the buffer will typically be 4096 or 8192 bytes long.
* "Interactive" text files (files for which isatty() returns True)
use line buffering. Other text files use the policy described above
for binary files.
encoding is the str name of the encoding used to decode or encode the
file. This should only be used in text mode. The default encoding is
platform dependent, but any encoding supported by Python can be
passed. See the codecs module for the list of supported encodings.
errors is an optional string that specifies how encoding errors are to
be handled---this argument should not be used in binary mode. Pass
'strict' to raise a ValueError exception if there is an encoding error
(the default of None has the same effect), or pass 'ignore' to ignore
errors. (Note that ignoring encoding errors can lead to data loss.)
See the documentation for codecs.register for a list of the permitted
encoding error strings.
newline is a string controlling how universal newlines works (it only
applies to text mode). It can be None, '', '\n', '\r', and '\r\n'. It works
as follows:
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enabled. Lines in the input can end in '\n', '\r', or '\r\n', and
these are translated into '\n' before being returned to the
caller. If it is '', universal newline mode is enabled, but line
endings are returned to the caller untranslated. If it has any of
the other legal values, input lines are only terminated by the given
string, and the line ending is returned to the caller untranslated.
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the given string.
closedfd is a bool. If closefd is False, the underlying file descriptor will
be kept open when the file is closed. This does not work when a file name is
given and must be True in that case.
The newly created file is non-inheritable.
A custom opener can be used by passing a callable as *opener*. The
underlying file descriptor for the file object is then obtained by calling
*opener* with (*file*, *flags*). *opener* must return an open file
descriptor (passing os.open as *opener* results in functionality similar to
passing None).
open() returns a file object whose type depends on the mode, and
through which the standard file operations such as reading and writing
are performed. When open() is used to open a file in a text mode ('w',
'r', 'wt', 'rt', etc.), it returns a TextIOWrapper. When used to open
a file in a binary mode, the returned class varies: in read binary
mode, it returns a BufferedReader; in write binary and append binary
modes, it returns a BufferedWriter, and in read/write mode, it returns
a BufferedRandom.
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opened in a text mode, and for bytes a BytesIO can be used like a file
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Even though IOBase does not declare read or write because
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consider those methods part of the interface. Also, implementations
may raise UnsupportedOperation when operations they do not support are
called.
The basic type used for binary data read from or written to a file is
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Text I/O classes work with str data.
Note that calling any method (even inquiries) on a closed stream is
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IOBase (and its subclasses) support the iterator protocol, meaning
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stream.
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rN Y dS X dS )zRead at most size bytes, returned as bytes.
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Nr )ri rt r r r r r r rE rE rF r a s z FileIO.readc C s | | t}z6t| jdt}t| jj}||krH|| d }W n t k
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or None if no data is available. Return an empty bytes object at EOF.
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N)ri rv r r r r r rE rE rF r s z FileIO.writec C s* t |trtd| t| j||S )a Move to new file position.
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zan integer is required)r r r ri r r r ra rE rE rF r_ s
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Can raise OSError for non seekable files.r )ri r r r r rd rE rE rF re s z FileIO.tellc C s2 | | |dkr | }t| j| |S )zTruncate the file to at most size bytes.
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FileIO.isattyc C s | j S )z6True if the file descriptor will be closed by close().)r rd rE rE rF r; s zFileIO.closefdc C sJ | j r| jrdS dS n0| jr,| jr&dS dS n| jrB| jr Z#d?d@ Z$dSdAdBZ%dCdD Z&dTdEdFZ'dUdGdHZ(dIdJ Z)dVdKdLZ*e
dMdN Z+dS )Wr3 a Character and line based layer over a BufferedIOBase object, buffer.
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zTextIOWrapper.writec C s t | j}|| j| _| jS rU )r# getincrementalencoderrN rO rP )rM Z make_encoderrE rE rF r[ s zTextIOWrapper._get_encoderc C s2 t | j}|| j}| jr(t|| j}|| _|S rU )r# getincrementaldecoderrN rO rS r! rT rQ )rM Z make_decoderr& rE rE rF _get_decoder s
zTextIOWrapper._get_decoderc C s || _ d| _dS )z Set the _decoded_chars buffer.r N)rE rF )rM charsrE rE rF r` s z TextIOWrapper._set_decoded_charsc C sF | j }|dkr | j|d }n| j||| }| j t|7 _ |S )z'Advance into the _decoded_chars buffer.N)rF rE r" )rM r offsetrf rE rE rF _get_decoded_chars s z TextIOWrapper._get_decoded_charsc C s$ | j |k rtd| j |8 _ dS )z!Rewind the _decoded_chars buffer.z"rewind decoded_chars out of boundsN)rF AssertionErrorr rE rE rF _rewind_decoded_chars s
z#TextIOWrapper._rewind_decoded_charsc C s | j dkrtd| jr&| j \}}| jr<| j| j}n| j| j}| }| j ||}|
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